Watch: How The Big Bang Theory's Jim Parsons annoyed Rihanna

The Big Bang Theory star Jim Parsons has figured out the way to get on Rihanna's nerves in just 'Four Five Seconds'!

That's right, one of the funniest men on TV happened to irritate one of the biggest music stars on the planet during a press tour for their new animated flick, Home.

Jim, known on our screens as Sheldon Cooper, spilled the reason why he annoyed Rihanna on The Tonight Show With Jimmy Fallon.

Watch above…and don't forget to shine bright like a diamond while you're at it.

Despite Jim's little RiRi faux pas, the pair seem to be pretty chummy while spruiking their new flick.

Check out this picture of them with voice co-star Steve Martin. What an unusual trio they make…

On Good Morning America last week: Steve Martin, Jim Parsons and Rihanna. And bunny ears. Image: Instagram/Jim Parsons.

Related video: TODAY chat to unlikely trio Jim, Rihanna and Steve